Embroidery sewing machine



I -Au .'1o, 1926; I. RADER EMBROIDERY SEWING MACHINE Filed June 5, 1924 gwomllo'c am iiaael;

Patented Aug. 10, 1926.

UNITED STATES 1,595,245- PATENT OFFICE.

IRVIN RADER, OF READING, PENNSYLVANIA, ASSIGNOR TO THE N OLDE AND HORST COMPANY, OF READING, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

EMBROIDERY SEWING MACHINE.

Application filed June 5,

My invention relates to sewing machines and particularly to those adapted to produce embroidery stitches by transversely oscillating the reciprocated needle bar so as to engage the rotary bobbin on opposite sides of a line passing through the axis of the latter, and it consists of improved reciprocating means adapted to equalize the stitches thus formed on said opposite bobbin sides. as more fully described in connection with the accompanying drawings andparticularly set forth in the subjoined claims.

Fig. 1 is a front elevation showing only the head frame and horn of a usual sewing machine as sufficient to describe my invention, a broken away fragment of the frame showing a portion in section and the headcap of the horn being removed.

Fig. 2 is a corresponding sectional side view taken on the line 2-2 of'Fig. 1.

Fig. 3 is a cross sectional view of the head frame on the line 3-3 of Fig. 1.

The sewing machine indicated in the drawings is of usual type having a rotary bobbin 5 carried in the horn 6 and a vertical needle bar 7 mounted in an oscillated sleeve 8 in the head frame 9, said bar 7 being reciprocated in said oscillated sleeve 8 to carry the needle 10 into engagement with the bobbin 5. This oscillated and reciprocated needle 10, as usual, engages the bobbin 5 on opposite sides of a line passing axially through the latter, and heretofore no difference has been made in this needle travel on said opposite bobbin sides resulting in a variation of the length of stitches drawn on said opposite sides and the consequent production of uneven and imperfect, embroidery stitches.

This difference in the stitches is due to the fact that the rotary shuttle in its ascending rotation engages with the thread of the needle at a higher point than it does in its descending movement on the opposite side of its vertical axial line. This difference-is clearly indicated in Fig. 1 which shows in full lines the lowermost needleposition to properly engage with the descending bobbin, and in dotted position the higher but proper lowermost'position' to engage with the ascending bobbin to draw equal stitches. The

difference between the high/and low needle ositions thus indicated is a measure of the armful inequality between the stitches here- 21 of sleeve 8.

1924. Serial No. 717,955.

late to novel reciprocating means for thus varying the needle "travel to produce equalv stitches on both bobbin sides as hereinafter fully described. r

of its length on one side at 21 so as to expose the bar 7, and the usual crank arm for reciprocating said bar 7 has heretofore commonly been directly attached to said bar giving it constant equal reciprooations' harmful to stitch formations as heretofore described.

In my improved construction I employ a post 31 vertically guided in head frame extension 9 and adjustably carrying a laterally projecting block 32 slidable up and down opposite the open or slotted portion This block 32 is provided with a horizontal slotted aperture and spaced slide Way 41 the latter being angularly inclined for a purpose hereinafter setforth. The sleeve carried needle bar 7 is provided with a loose collar 42 freely slidable thereon and having a right-angled stud 43 engaged in and projecting through block slot 40, to which projected stud crank arm 30 is pivotally connected by screw bolt 44. A second collar 45, fixed to bar 7 has a similar right angled stud 46 engaging in block slide way 41. A projecting pin or pins 50 from collar 42 engages a vertical slot 51 in sleeve 8 to cause said studs 43 and 46 to move lengthwise in their respective slot 40 and slide Way 41 as said sleeve is oscillated on its pivots 17 and 18. The crank arm 30 and link 20 are operated by their well known connected mechanism in usual manner and are synchronized with the bobbin rotations so that the latter engages with the needle inclination of slide .way 41 is such that as stud 46 is traversed from the low to the high side of said slide way it will be raised the exact distance indicated between the full and dotted needle positions shown in Fig. 1. It will be seen that by connecting'crank arm 30 to loose collar 42- on needle bar 7 it reciprocates block 32 in a fixedly measured up and down movement, but the efiective re sults of the latter on needle bar 7 is modified by the position of stud 46 of fixed collar 45 in slide Way 41 and the latter is varied by the oscillations of sleeve 8 so as'to vary the needle travel; the inclination of slide Way 41 determining such required variation to equalize the stitch formations.

The specific structure thus described n'l'ay be modified as required to suit different sewing machine construct-ions Without departing from my invention, and I do not desire to limit myseli to'th'e preferred embodiment above set forth and shown in the drawing.

, What I claim:

1. In an embroidery sewing m'achine having a rotary bobbin, a vertically reciprocated and horizontally oscillated needle bar, a needle carried by said bar in successive reciprocations and oscillations thereof into cooperative relations with said bobbin on opposite sides of a line passing through the axis of the latter means for reciprocating said needle bar and varying the needle descending movements on said opposite axial bobbin sides comprising a vertically reciprocated actuating.- member having a fixed travel and an inclined slide Way; a loose and a fixed collar on said needle bar said loose collar being movably engaged by said actuating member and said fixed collar having a stud traversed in said actuating memb'er slide Way by said needle bar oscillations. V 2. In an embroidery sewing machine having a. rotary bobbin, a needle, a needle bar for the latter, a carrying sleeve for said needle bar and means to oscillate the same so as to swing said needle to opposite sidesof a line passing through the axis of said bobbin, a vertically guided slide member adjacent said sleeve and having a slotted aperture and an inclined slide Way, afixed collar on said needle bar having a stud engaging said slide Way, a loose collar onsaid needle bar having a stud projected through said slotted aperture, and a crankarm connected to said projecting stud to reciprocate said needle bar, said studs being traversed in their respective aperture and slide Way by said sleeve oscillations to vary the needle descending movements on said opposite bobbin sides.

In testimony whereof I; afii-x-niy signature.

IRVIN RADER. 

